Mix cabbage, red bell pepper, green onions, sesame seeds, jalapeno pepper, 1 teaspoon garlic flakes, and 1/2 teaspoon salt together in a bowl for the slaw.

Pour honey, lime juice, sesame oil, mustard, ginger, 1/2 teaspoon garlic flakes, 1/4 teaspoon salt, and wasabi powder into a jar. Shake until honey is dissolved. Pour over the slaw.

Heat an 8-inch cast iron skillet over medium-high heat. Coat bottom of the pan with coconut oil and olive oil.

Mix flour and 1/4 teaspoon salt together in a dish. Dredge cod pieces in the mixture, coating all sides. Fry cod in the hot oil, turning once, until outsides are golden, about 6 minutes. Transfer onto paper towels to absorb excess oil.

Drain the slaw slightly. Place 1/4 of the cod on a tortilla and squeeze some lime juice on top. Add 1/4 of the slaw; top with roasted cashews. Repeat with the remaining tortillas, lime, slaw, and cashews.